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This paper studies the determination with two kinds of method to determine the content of calcium magnesium ions. A kind of method is the traditional EDTA titration method of calcium magnesium; Another method is to use ultraviolet - visible spectrophotometry.the content of calcium magnesium, acidic Abram K for chrome colour-display reagent, the ammonia in PH about 10.0 buffer solution in calcium magnesium ions all can with colour-display reagent generation rose red complexes in maximum absorption wavelength, 510nm place, first measure the absorbance of the total calcium magnesium ammonium oxalate, then use calcium ion precipitation, will be measured again magnesium ions absorbency. Experimental results show that: calcium magnesium with acid mixture of complexes chrome orchid K in 510nm maximum absorption wavelength, on the wavelength and the best condition, calcium magnesium mixture of complexes corresponding molar absorption coefficient for 103L / (6.37 x mol) cm, the total concentration, calcium magnesium
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